Three-component rotary seismograph

Abstract

The invention provides a three-component rotary seismograph, which comprises three fiber-optic gyroscopes and a circuit resolving module, wherein the sensitive axes of the three fiber-optic gyroscopesare mutually orthogonal; and the input end of the circuit resolving module is connected with the detection signal output ends of the fiber-optic gyroscopes, and the circuit resolving module is used for generating modulation signals required by the fiber-optic gyroscopes, demodulating the detection signals output by the detection signal output ends to obtain a detection angular speed and carryingout error compensation on the detection angular speed. The three identical fiber-optic gyroscopes are orthogonally assembled, and measurement errors caused by incomplete orthogonality of three sensitive axes are compensated. The invention provides the rotary seismograph which is high in precision, high in stability, small in angular velocity error and capable of measuring components in three orthogonal directions. Furthermore, when the rotary seismograph is applied to the monitoring of the seismic rotational motion, the indexes of the three rotational motions in the rotational seismology can be accurately and stably measured in real time, and the rotary seismograph has important guiding significance in the development of strong ground motion seismology, seismic engineering and seismic instruments.

Description

technical field [0001] The present application relates to the technical field of seismometers, in particular to a three-component rotational seismometer. Background technique [0002] Seismic waves are elastic waves radiated from the seismic source inside the earth to the surrounding through the crust. The study of seismic waves helps to understand the real situation inside the earth. It is crucial to develop earthquake models to understand the generation, propagation and even prediction of earthquakes. [0003] Traditional seismometers can only measure linear motion, so for a long time in the history of seismic wave research, it was limited to the translational component, and the development of rotational seismology was therefore slow. However, the rapid development of fiber optic gyroscope has greatly promoted its application in various fields, and the three-component fiber optic gyroscope emerged as the times require. There are important applications in the field, but t...

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Problems solved by technology

[0005] However, the current three-axis integrated fiber optic gyroscope technology solutions are few, and the actual commercial products are also very scarce. The few solutions focus on reducing the size and power consumption by sharing optical devices and circuits, and do not consider the three-axis integrated fiber optic gyroscope. Angular velocity measurement error caused by incomplete orthogonality, and the optical path structure in these schemes is relatively traditional, which cannot meet the accuracy requirements of angular velocity sensors in the field of seismic monitoring

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